docs: def hash_bytes( key, seed = 0x0, x64arch = True ):
      ''' Implements 128bit murmur3 hash. Returns a byte string. '''
  
      hash_128 = hash128( key, seed, x64arch )
  
      bytestring = ''
  
      for i in xrange(0, 16, 1):
          lsbyte = hash_128 & 0xFF
          bytestring = bytestring + str( chr( lsbyte ) )
          hash_128 = hash_128 >> 8
  
      return bytestring